Eugene Roubaix. Eugene Roubaix. The 13.7 mile course features varied terrain and one straight stretch of gravel. The Eugene Roubaix is relatively flat with approximately 200 meters of climbing and on 'berg (Oak Hill Road).. The real trademark is the 1.5 mile gravel section on each lab. The Start/Finish is on Central road well before the gravel section. Map available online here.